CGR Ass 1

#include <iostream>
#include <cmath>
#include <graphics.h>

using namespace std;

class DDA{
    float xi, yi, xf, yf, dx, dy, steps;
    float incX, incY;
    float X, Y;
public:
    void calc(float xs, float ys, float xe, float ye){
        xi = xs; yi = ys; xf = xe, yf = ye;
        dx = (xf - xi); dy = (yf - yi);
        steps = abs(dx) >= abs(dy) ? abs(dx) : abs(dy);
        incX = dx/steps; incY = dy/steps;
        X = xi; Y = yi;
    }
    void drawLine(){
        for (int i = 1; i <= steps; i++){
            putpixel(floor(X), floor(Y), MAGENTA);
            X += incX; Y += incY;
            delay(5);
        }
    }
};

class Bresenham {
    int xc, yc, r, xi, yi, p;
public:
    void calc(int XC, int YC, int Radius){
        xc = XC; yc = YC; r = Radius;
        xi = 0; yi = r;
        p = 3-(2*r);
    }
    void drawCircle(){
        while (xi < yi){
            putpixel(xc + xi, yc + yi, YELLOW);
            putpixel(xc - xi, yc + yi, YELLOW);
            putpixel(xc + xi, yc - yi, YELLOW);
            putpixel(xc - xi, yc - yi, YELLOW);
            putpixel(xc + yi, yc + xi, YELLOW);
            putpixel(xc - yi, yc + xi, YELLOW);
            putpixel(xc + yi, yc - xi, YELLOW);
            putpixel(xc - yi, yc - xi, YELLOW);
            xi++;
            if (p < 0){
                p += ((4 * xi) + 6);
            } else {
                yi--;
                p += ((4 * (xi - yi)) + 10);
            }
            delay(1);
        }
    }
};

int main() {
    int gd = DETECT, gm;
    int xc = 300, yc = 250, r = 100;
    Bresenham B1, B2;
    DDA L1, L2, L3;
    initgraph(&gd, &gm, NULL);

    B1.calc(xc, yc, r);
    B2.calc(xc, yc, r/2);
    B1.drawCircle();
    B2.drawCircle();

    L1.calc(xc, (yc - r), (xc + (r / 1.154)), (yc + (r / 2)));
    L2.calc(xc, (yc - r), (xc - (r / 1.154)), (yc + (r / 2)));
    L3.calc((xc + (r / 1.154)), (yc + (r / 2)), (xc - (r / 1.154)), (yc + (r / 2)));
    L1.drawLine();
    L2.drawLine();
    L3.drawLine();

    cin.get();
    closegraph();
    return 0;
}